feat: replace email flows with in-app notifications

Add recipient notification detail and filtering, a queued admin composer, and contextual automatic titles. Retire email delivery, obsolete auth routes, newsletter data, and related templates and settings.

apps/users/tasks.py

@@ -70,21 +70,3 @@ def send_critical_sms(self, mobile: str, kind: str, code_or_message: str):
     except Exception as exc:
         logger.error("Failed to send SMS to %s for kind=%s: %s", mobile, kind, exc)
         raise self.retry(exc=exc, countdown=60)
-
-
-@shared_task(bind=True, max_retries=1)
-def send_verification_email(self, user_id, verification_url):
-    logger.info("Legacy verification email task skipped for user=%s url=%s", user_id, verification_url)
-    return {"skipped": True}
-
-
-@shared_task(bind=True, max_retries=1)
-def send_password_reset_email(self, user_id, reset_url):
-    logger.info("Legacy password reset email task skipped for user=%s url=%s", user_id, reset_url)
-    return {"skipped": True}
-
-
-@shared_task(bind=True, max_retries=1)
-def send_email_verified_success(self, user_id: int):
-    logger.info("Legacy verification success email task skipped for user=%s", user_id)
-    return {"skipped": True}